List of motorized bike spark plugs

I'm partial to NKG's for small engines. Most m/c OEM plugs are NGK if Japanese. Cars, I'm a believer in using OEM plugs. Plugs in a lot of motors are a bear to change. Do it once and done for 100k. A lot of pro mechanics say to use OEM designed for the motor. Plugs not designed for the application can cause issues.
 
I changed them on one, and, as per the manual, I had to take all the top engine mounts completely off, and lean the entire engine forward with a ratchet strap to be able to access the back plugs.
My sister's crappy mini van you have to remove the intake manifold and fuel rail to get to the back plugs.
 
I bought OEM Harley Davidson S/P for my 2022 Harley and their Made in India 🤷‍♂️
Maintenance schedule says to change S/P every 30k miles,

My Harley takes 4 S/P - 2 per cyl
S/P gap specs .031" - .035"
Plugs were at and over the max specs .035" I set the gap @ .033"
Manual says to check the S/P gap before installing, So I guess I can't complain 🤷‍♂️

I bought NGK S/P for my Yamaha and they were always gaped correctly
I just might switch to NGK S/P for my Harley
 
I changed them on one, and, as per the manual, I had to take all the top engine mounts completely off, and lean the entire engine forward with a ratchet strap to be able to access the back plugs.
My sister's crappy mini van you have to remove the intake manifold and fuel rail to get to the back plugs.

Better you than me there youngsters...lol...lol.

I would charge someone right out the 'Whazoo" to tune-up vehicles like that because I really had zero interest in even touching a vehicle so badly engineered that it required dealerships to usually do the job...I could do it too, I just didn't want to...lol....lol...lol.
 
Pre 1990 or close Champion was my go to plug. I thought they were the best.
Today they rely on their world famous Logo and not quality
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